Fracking is a method for extracting natural gas and oil from underground, not for producing hydrogen.

Electrolysis is the process of splitting water into hydrogen and oxygen using electricity.

Steam Reforming is the most common method for producing hydrogen, accounting for around 95% of global hydrogen production.

Steam Reforming is the process of converting natural gas into hydrogen and carbon dioxide.

Electrolysis using renewable electricity is a renewable source of hydrogen because it does not rely on fossil fuels.

Gasification is the process of converting coal or biomass into hydrogen and carbon monoxide.

Electrolysis is the most expensive method for producing hydrogen, due to the high cost of electricity.

Photolysis is the process of converting water into hydrogen and oxygen using sunlight.

Steam reforming produces carbon dioxide as a byproduct, which contributes to greenhouse gas emissions.

Gasification can use a variety of feedstocks, including coal, biomass, and natural gas.

The overall reaction for steam reforming of methane is CH₄ + 2H₂O → CO₂ + 4H₂.

The overall reaction for gasification of coal is C + H₂O → CO + H₂.

The overall reaction for electrolysis of water is 2H₂O → 2H₂ + O₂.

Electrolysis requires a lot of electricity, which can be expensive and may come from non-renewable sources.

Photolysis is a renewable source of hydrogen because it uses sunlight to split water into hydrogen and oxygen.